package cn.edu.scau.cmi.wujiaxian.exercise9;

import java.util.Scanner;

public class Example9_9 {
	

	public static void main(String[] args) {
		String regex = "[a-zA-Z]+";
		@SuppressWarnings("resource")
		Scanner scanner = new Scanner(System.in);
		String string = scanner.nextLine();
		if (string.matches(regex)) {
			System.out.println(string);
		}
	}
	
}
